1. Printers
A printer is another example of an output device that can be used to print text and graphics
on mediums such as paper, transparency film or even cloths.
Figure 3: Printer
A photo printer is a colour printer that produces photo quality pictures.
An image setter produces high quality output compared to an ordinary laser printer. An
image setter is a high resolution output device that can transfer electronic text and graphics
directly to film, plates, or photo-sensitive paper.
Figure 4: Printer
2. Scanners
In computing, a scanner is a device that analyzes images, printed text, handwriting, or
objects (such as an ornament) and converts it into a digital image.
These are examples of scanners:
a. The flatbed scanner is the most common in offices.
b. Hand-held scanners are no longer used due to the difficulty in obtaining a highquality
image.
c. Digital camera scanners, that are based on the concept of reprographic cameras.
d. Planetary scanners, which take photographs of books and documents
e. 3D scanners, for producing three-dimensional models of objects,
Planetary and 3D scanners are considerably more expensive than other types of scanners.
( source http://en.wikipedia.org/wiki/Image_scanner)
Figure 5: Handheld Scanner
Drum
Sheet-fed Flatbed
3. LCD Projector
LCD projector is a type of video projector for displaying video, images or computer data on
a screen or other flat surface. It is a modern equivalent of the slide projector or overhead
projector.
A Liquid Crystal Display (LCD) projector uses its own light source to project what is
displayed on the computer onto a wall or projection screen. A digital light processing (DLP)
projector uses tiny mirrors to reflect light that can be seen clearly in a well-lit room.
Figure 6: LCD Projector
4. Digital Cameras
Digital Cameras are electronic devices used to capture and store photographs digitally,
using the memory card without using photographic film like conventional cameras, or
recording images in an analog format to magnetic tape like many video cameras.
Modern compact digital cameras are typically multifunctional, with some devices capable of
recording sound and/or video as well as photographs.
5. External CD Drives
The external DVD/CD-RW combo drive functions as a DVD player, a CD-RW drive and a
CD-ROM drive. This allows you to install computer applications, files, music and movies on
CD. It is easy to be carried around.
Figure 8: CD/DVD Writer
6. External Storages
External storage is an alternative storage. It is very useful to store programs and data for
future use. The storage is required for two reasons:
1. The working memory of the CPU is limited in size and cannot always hold the amount of
data required.
2. Data and programmes in storage do not disappear when the power is turned off.
Figure 8: Storage Device
